Heater.



PATENTED Nov. 10, 1903; H. c. TABRETT & W. LEWIN.

HEATER.

APPLIGATION FILED APR. 8. 1903.

Q SEBBTSSHEET 2.

NO' MODEL.

IV] TNESSES w: mains awns cc. wuTu-uwn vn a-mm'rm u c UNITED STATESPatented November 10, 1903.

PATENT OFFICEe HENRY C. TABRETT AND WALTER LEWIN, OF SAN FRANCISCO,CALIFORNIA.

HEATER.

SPECIFICATION forming part of Letters Patent No. 743,769, dated November10, 1903.

Application filed April 8, 1903. Eerial No. 151,670. (No d l.).)

To all whom it may concern:

Be it known that we, HENRY C. TABRETT, residing at 3847 Twenty-firststreet, and WAL- TER. LEWIN, residing at1227 Page street, in

the city of San Francisco, county of San Francisco, and State ofCalifornia, have invented certain newandusefnl ImprovementsinEvaporators or Heaters; and we do hereby declare the following to he afull, clear, and exact description of said invention, such as willenable others skilled in the art to which it most nearly appertains tomake, use, and practice the same. 4

This invention relates to improvements in evaporators or heaters forutilizing the waste heat in smoke-stacks, breechings, uptakes, or thelike; and it consists of the novel construction and arrangement of theparts.

The objects sought to be accomplished are to evaporate salt sea-water orfoul water, whereby fresh pure water may be obtained, or to provide aneconomical means for heating any liquid or fluid, such as steam, air, orother gases.

Broadly,'the invention consists of an initial or precipitation drumconnected'by tubes (exposed to the waste heat) with a larger drum orreservoir provided with a separator and water-gage, pop-valve, draw-offvalves,

and precipitation-legs suitably combined therewith.

In the drawings, Figure 1 is a front elevation of a heater constructedin accordance with this invention disposed in the uptake of a battery ofboilers, which are indicated in dotted outline, the invention beingbroken away in parts to better disclose its construction. Fig. 2 is aside elevation of the same.

In detail the construction consists of the receiving-drum A, in to whichthe salt sea-water, for instance, is pumped through the inletvalve A.The receiving-drum is-connected by the heat absorbing tubes B, disposedacross the uptake and terminating in the shell of the seconddrum O, theends of the tubes beingexpanded and beaded over at each end, where theyjoin the respective drums. The quantity of water in the heater isindicated by the gageglass D, set on the side of the drum 0, andprovided with the tube D, leading back to the drum A, to balance thepressure in the glass D. The separator consists of the outer shell E,set in the annular pillar E, riveted to the upper dome'of the drum 0.The shell E is capped by the top E", to which the flanged T E? isattached to lead the dry vapor to a suitable condenser. (Not shown.) Theseparator is provided with the reliefvalve E to blow otfi excesspressure. The vapors arising from the surface of the water in the drum Cescape through the perforations w of pipe E upward into the separatorand are released under the cap E having the downwardly-extending wallE', which forms the annular spaces E E through which the vapor mustcirculate before escaping from the separator. The condensation or a gulpof water within the separator drains back into the drum A through thepipe E The drums and tubes are accessible for replacement, cleaning,850., through the door A in the drum A and through the manhole G in thedrum 0. In the process of evaporation the specific gravity of the-waterin the drum A becomes greater, and it sinks into the precipitation leg Afrom whence it is led to the bilge or sea.

The drum A can be of cast-iron and is preferably set lower than the drum0 to give a free rise to the hot water. It is obvious, however, that theconstruction could be variously disposed without departing from thespirit of this invention.

In operation the drum-A is pumped full until the water rises to a pointabove the level of the exits of tubes B, as indicated in the gage-glass.Under the influence of the heat absorbed by the tubes the waterevaporates, precipitating the heavier impurities into the drum A, thepurified vapors rising into the separator and escaping dry to thecondenser. After a few hours running, during which the drum 0 has beenrelieved of the first filling of salt water through the petcock G thedrum O'should not prime, which confines all deposits to the drum A, fromwhich they are readily removable. A mean water-level is preserved in theheater by an automatic feed to the drum A and an automatic blow-0E onthe leg A at A.

Having thus described this invention, what is clai1ned,and desired to besecured by Letters- Patent, is

. 1. The combination with the smoke-passage of a boiler of a heaterconsisting of a receiving-drum having an inlet above and an outlet belowthe center thereof, and a precipitation-leg connected to the bottomthereof; and tubes leading from the receiving-drum across thesmoke-passage to a second drum communicating with a separator,consisting of a series of vertical annular passages, withintercommunication between alternating top and bottom; a suitableoutlet-drain and safetyvalve on said separator; and a water-gagecommunicating with both drums; and a door in said receiving-drum in linewith the conmeeting-tubes.

2. The combination with the smoke-passage of a boiler, of aheater-consisting of a receiving-drum having suitable inlets and outletsand tubes leading from the receiving-drum across the smoke-passage to asecond drum; a separator connected to said second drum, and consistingof a series of vertical annular passages intercommunicating alternatelytop and bottom; and a suitable outlet from said separator, and awater-gage communicating with both drums.

3. A heater such as described, consisting of a plurality of drumsconnected by heat-absorbing tubes; and having a suitable vaporseparator;a safety-valve; water-gage communicating with both drums, andprecipitation-leg, suitably combined therewith.

4. A heater such as described, comprising a plurality of drums connectedby heat-absorbing tubes, a suitable vapor-separator, a perforated pipecommunicating with said separator and extending into one of said drums,a safety-valve, a water-gage communicating with both of said drums, anda precipitationleg leading from one of said drums.

In testimony whereof we have hereunto set our hands this 26th day ofMarch, 1903.

HENRY C. TABRETT. WALTER LEWIN.

Witnesses:

BALDWIN VALE, A. J. HENRY.

